研究目的
To develop a highly selective fluorescence chemosensor based on carbon-dot-aerogel for the detection of aniline gas.
研究成果
The CDs-silica aerogel composite demonstrates high selectivity and sensitivity for aniline gas detection, with a quenching efficiency up to 76.4%. It offers a low-cost, simple, and environmentally friendly approach for solid-state fluorescence sensing, potentially applicable in environmental monitoring.
研究不足
The detection limit for aniline gas is 77.6 ppm, which is higher than some electrochemical methods. The presence of other gases can slightly affect quenching efficiency, though within acceptable range. The method may require optimization for lower detection limits and real-world application complexities.
1：Experimental Design and Method Selection:
The study used a sol-gel method to prepare CDs-silica aerogel composites, leveraging the hydroxyl groups on CDs to initiate gelation of tetraethyl orthosilicate (TEOS). Hydrothermal synthesis was employed for CDs preparation.
2：Sample Selection and Data Sources:
Sawdust was used as the carbon precursor for CDs synthesis. Aniline gas and other volatile organic vapors were used for sensing tests.
3：List of Experimental Equipment and Materials:
Transmission electron microscopy (TEM), high-resolution TEM (HRTEM), Fourier-transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM), Brunauer-Emmet-Teller (BET) analyzer, fluorescence spectrometer. Materials include sawdust, TEOS, ethanol, water, and various organic vapors.
4：Experimental Procedures and Operational Workflow:
CDs were synthesized hydrothermally from sawdust at 200°C. CDs-silica aerogel was prepared via sol-gel method with optimized ethanol:water ratio. The composite was characterized and tested for fluorescence quenching upon exposure to aniline and other gases.
5：Data Analysis Methods:
Fluorescence quenching efficiency was calculated as (1 - F/F0). Linear regression was used for detection limit calculation. Selectivity was assessed by comparing quenching effects of different gases.
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Transmission Electron Microscopy
Characterize morphology and size of carbon dots
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High-Resolution Transmission Electron Microscopy
Examine crystalline structure of carbon dots
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Fourier-Transform Infrared Spectroscopy
Analyze functional groups on carbon dots and composites
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X-ray Photoelectron Spectroscopy
Analyze composition and surface state of carbon dots and composites
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Scanning Electron Microscope
Characterize porous structure of aerogel composites
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Brunauer-Emmet-Teller Analyzer
Measure specific surface area and porosity of aerogel composites
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Fluorescence Spectrometer
Measure fluorescence emission and quenching
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